docs: def getConfigFile():
      """Returns the config file location.
  
      If $WAKATIME_HOME env varialbe is defined, returns
      $WAKATIME_HOME/.wakatime.cfg, otherwise ~/.wakatime.cfg.
      """
  
      fileName = '.wakatime.cfg'
  
      home = os.environ.get('WAKATIME_HOME')
      if home:
          return os.path.join(os.path.expanduser(home), fileName)
  
      return os.path.join(os.path.expanduser('~'), fileName)